Airworthiness Directive · Amendment 39-19040 · Doors
The Boeing Company Airplanes
This AD applies to The Boeing Company Model 757-200, -200PF, and -200CB series airplanes, certificated in any category, equipped with a main cargo door (MCD), except those airplanes that have been converted from a passenger to freighter configuration in accordance with Supplemental Type Certificate ST01529SE (http://rgl.faa.gov/Regulatory_and_Guidance_Library/rgstc.nsf/0/9c0283b6ce0b9ff18625806b007340b9/$FILE/ST01529SE.pdf).
We are adopting a new airworthiness directive (AD) for certain The Boeing Company Model 757-200, -200PF, and -200CB series airplanes. This AD was prompted by an analysis of the cam support assemblies of the main cargo door (MCD) that indicated that the existing maintenance program for the cam support assemblies is not adequate to reliably detect cracks before two adjacent cam support assemblies could fail. This AD requires an inspection to determine part numbers, repetitive inspections to detect cracking of affected cam support assemblies of the MCD, and replacement if necessary. We are issuing this AD to address the unsafe condition on these products.
At the later of the times specified in paragraphs (g)(1) and (g)(2) of this AD: Inspect the cam support assemblies of the MCD to determine whether part number (P/N) 69-23588-5, 69-23588-6, 69-23588-7, 69-23588-8, 69-23588-9, or 69-23588-10 is installed. A review of airplane maintenance records is acceptable in lieu of this inspection if the part number(s) of the cam support assemblies of the MCD can be conclusively determined from that review.
(1) Before the accumulation of 18,000 total flight cycles since installation of the MCD. If the flight cycles since installation of the MCD are not known, use total airplane flight cycles.
(2) Within 2,743 flight cycles or 27 months after the effective date of this AD, whichever occurs later.
If, during the inspection required by paragraph (g) of this AD, any cam support assembly of the MCD having P/N 69-23588-5, 69-23588-6, 69-23588-7, 69-23588-8, 69-23588-9, or 69-23588-10 is determined to be installed: At the later of the times specified in paragraphs (g)(1) and (g)(2) of this AD, do an ultrasonic inspection to detect cracking of the affected cam support assemblies of the MCD; and do all applicable replacements; in accordance with the Accomplishment Instructions of Boeing Alert Service Bulletin 757-52A0094, Revision 2, dated May 2, 2017. Do all applicable replacements before further flight. Repeat the inspection thereafter at intervals not to exceed 6,000 flight cycles. Replacement of a cam support assembly of the MCD does not terminate the repetitive inspections required by this paragraph.
The aircraft, engines and makers this AD names, by the model designations in its text. A model listed here may still be outside the AD's serial ranges.
Aircraft
